With millions of apps out there, it's hard to find the good ones. Here are the best apps you've probably never heard of. The list includes movie apps, medical apps, translation apps, games, travel apps, and even a giant alarm clock!

Paper

Used by more than 13 million people worldwide, Paper turns your iPad into a digital notebook, with everything you need to bring your ideas to life.

Discover the world's coolest insider tours and activities with Viator - one of National Geographic's "Favorite On-The-Road Apps."

Viator, a TripAdvisor company, puts exclusive access to thousands of destinations in the palm of your hand, as well as 600,000+ user reviews and photos. It's like ordering off the secret menu for travel.